Packet Generation Method, Communication Method, Packet Processing Method and Data Structure

1. A communication method for receiving an IP packet that includes an IP header and an IP data portion, the IP header including an address portion and an option area, the option area including an end position indicator indicating an end position of the option area, the method comprising the steps of: receiving the IP packet from a network by an individual terminal, the IP packet further including an additional data provided in an additional data area defined in the IP packet header following the end position indicator; and reading the additional data in the option area, wherein: the additional data is a group number used to define a plurality of communication partners to be combined, and the method further comprises the steps of: comparing a reference group number designated for the individual terminal with the group number used to define a plurality of communication partners to be combined in the additional data area; and determining whether performing TCP/IP reception process or abandoning the IP packet, in accordance with the comparison results.

2. The communication method according to claim 1 , wherein the IP packet is abandoned when the group number and the reference group number do not match in the comparing step.

3. The communication method according to claim 1 , wherein a TCP/IP processing form is changed in accordance with the comparison results.

4. A communication method for receiving an IP packet that includes an IP header and an IP data portion, the IP header including an address portion and an option area, the option area including an end position indicator indicating an end position of the option area, the method comprising the steps of: receiving the IP packet from a network by an individual terminal, the IP packet further including an additional data provided in an additional data area defined in the IP packet header following the end position indicator; and reading the additional data in the option area, wherein: the additional data is a group number used to define a plurality of communication partners to be combined, and the method further comprises: obtaining the group number from the additional data area; and performing a process in accordance with a control command for notifying the communication partners defined by the group number.

5. A communication method for receiving an IP packet that includes an IP header and an IP data portion, the IP header including an address portion and an option area, the option area including an end position indicator indicating an end position of the option area, the method comprising the steps of: receiving the IP packet from a network by an individual terminal, the IP packet further including an additional data provided in an additional data area defined in the IP packet header following the end position indicator; and reading the additional data in the option area, wherein: the additional data is a group number used to define a plurality of communication partners to be combined, the method further comprises obtaining the group number from the additional data area, and a process based on a control command is performed when a reference group number designated for the individual terminal and the group number used to define a plurality of communication partners to be combined in the additional data area do not match.

6. A communication method for receiving an IP packet that includes an IP header and an IP data portion, the IP header including an address portion and an option area, the option area including an end position indicator indicating an end position of the option area, the method comprising the steps of: receiving the IP packet from a network by an individual terminal, the IP packet further including an additional data provided in an additional data area defined in the IP packet header following the end position indicator; and reading the additional data in the option area, wherein the IP packet is abandoned when a network address obtained based on an IP address of a transmission source transmitting the IP packet and a network address designated for the individual terminal do not match.

7. A communication method for receiving an IP packet that includes an IP header and an IP data portion the IP header including an address portion and an option area the option area including an end position indicator indicating an end position of the option area, the method comprising the steps of: receiving the IP packet from a network by an individual terminal, the IP packet further including an additional data provided in an additional data area defined in the IP packet header following the end position indicator; and reading the additional data in the option area, wherein: the additional data is a group number used to define a plurality of communication partners to be combined, the method further comprises obtaining the group number from the additional data area, and an IP address for a transmission source transmitting the IP packet is held when a reference group number designated for the individual terminal and the group number used to define a plurality of communication partners to be combined in the additional data area match.